Lifting-jack



(No Model.)

B. A. SAHLMANN J. SCHENOUSKY.

- LIPTINGr. '\01..

No. 395,517. Patented Jan. l, 1889.

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clea-r, andexact description of the invention,

listino Staates Parenti" rtree@ BENGT AUGS" SAHLMANN AND JOSOF SCHENOSKY, OF iiARlNETTE,

l VISCONSIN.

LIFTINGHJACK.

SPECIFICATION forming part ot' Letters Patent No. 395,51*?, dated January 1, 1889 Application tiled September l0, 1888. Serial No, 285,003. (No model.)

T all 10700771, 'it may concor/L:

Be it known that we, BENGT A. SMIL- MANN and .loser ScHnNoUsKY, citizens of the United States, residing at lllarinette, in the eountv ot' Marinet-te and State ot W isconsin, have inventml certain new and usefull lm- ]novennents in Lifting-Jacks; and we do hereby declare the following to be a full,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has relation to lifting-jael s adapted to be operated by hand; and among the objects in view are -to provide a jack of this class that is capable of raisin g heav)T weights with the least possible power, which shall be strong and durable and not liable to get out of order, and which eau he provh'led at a minimum cost.

A further object ol' the invention is to provide an alarm which will indicate when the i jack has been raised to its highest position, whereby accidents and consequent damage i are avoided.

Other objects and advantages of the invention will hereinafter appear, and the novel features of the invention will be'pari ieularlv pointed out in the claims.

Referring' to the drawings, Figure 'l is a side elevation of a jack constructed in aeeordanee with our invention, portions being broken away, showing the interior alarm mechanism. Fig. 2 is a front elevation showing the lifting-arm. Fig. 3 is a skeleton view, in side elevation, show in the mera-tin g meehanism; and Fig. 1l is a ceu tral transverse vertical section showingl the train olil gears and alarm iuechanism. i

Like numerals of rei rence .indieaie like parts in all the figures of the drawings.

The frame of the jack consists ol the front and rear walls, i and 2, which are secured at their upper end by a metal plate or cap, 3, and at their lower end by a foot-plate, i, which is provided with one or more spikes, 5, :for pre- L venting the jack from slipping. interposed between the front and rear walls, l and 2, are removable side walls, (l, which are secured to the front and rea-r walls by means oi. bolts or screws or other securin g devices 7.

ll'ithin the jack as thus constructed is supported and secured rigidlyin position a metal gear-frame, S, in which is jourualed, at about the center oit' the jack and near the lower end of the frame, a power-shaft, tl, which projects out through the rear wall, 2, is provided with an operatiiig-crank, 10, a ratchet-wheel, il, and a grav `if-pawl, l2, adapted to be thrown into and out of connection with the wheel. The shaft t) atthat point thereof within the geanframe ti is provided with a small pinion, i3, which meshes with a gear-wheel, i4, mounted on a superimposed shaft, l5, carrying a small pinion, lli, which in turn meshes with a still larger gear, i7, mounted. on a third shaft, irl, which also earries a small pinion, it), which operates in and actuales a vertical reciprocating rack-bar, 20, adaptcil to move 'within the frame 8 and earrying at its upper end a rest, 2l, designed to be inserted under an object and to raise the same when the gears are pnt iu motion.

Proj eeting from the Aupper end of the rackbar there is a depend ing lifting-arm, 22, which rides in a vertical slot, 23, formed in the front wall, l, of the jack, and moves against a guide-plate, 24:, secured along the edge of the slot 2li and terminates in an angular supporting end, 25, projecting at a right angle from the jack and designed for insertion under objects which on account of their height could not receive the rest Having either inserted the .rest 2l or the supporting end 25 under an object, it is evident that b v revolving the shaft Vt) through the medium ot' the crank lo the gears will be set in motion, and that hv their relative size and arrangement the least amount of power possible will result in the greatest possible power at the gear lil, which imparts motion to the raclebar 2O and raises or lowers the same in the direction in which the gears are turned. lt Vis also evident that in. raising a heavjT object the pawl 'i2 will ride over the teeth of the ratchet il and serve to hold the l same against an undesired return movement when the hand of the operator is removed from the crank 10.

For the purpose of preventing the rack-bar 2O from being raised an unsafe dist-ance, so

of the jack and that it will slip from out its vertical guide, and thus permit the object being raised to fall, we have provided an alarm mechanism, whereby when said rack-bar reaches acertain point of elevation the operator will be positively noti- 'lied of this fact. This is accomplished as l[follows:

At one side oi' the rack-bar 20, and scwured to the inner surface of one of the walls, 1 or 2,

of the jack, is a bell, 2G, and to the same wall, 1

by means of a projecting lug, 27, there is secured a coiled spring, 28, one end otl which made fast to the wall and the opposite end of which projects laterally from the spring, -forming an arm, 29, and is bent to form an eye, 30, and is then returned under the bell 20 and provided with a hammer, 3l, adapted to be operated against the bell.

Above the lug 27 upon a pivot, 32, there is mounted a bell-crank lever, 233, one end of which is connected by means of a link, 3ft, to the eye 30 of the hammer, and the other end of which projects in the path of a pin, 35, projecting laterally from the lower end of the rack-bar 20. From this it is obvious that as the rack-bar rises t-he pin 35 com cs in contact with the projecting arm of the bell-crank lever 33 and trips the same, forcing it to draw upon the link 04 and arm 29 of the spring 28 and against the tendency of the spring. Then the pin 35 has passed the bell-crank lever 33, the spring 2S causes the parts to resume their normal position, as shown in Fig. i, and also serves to throw the hammer 31 in contact with and thereby sound the bell 26. lly reversing the motion of the crank 10 the rackbar and the object-supporting arms are returned to their normal position, and by reason of the construction o t' the bell-tripping mechanism the pin 35 is permitted to pass Without sounding the alarm.

Having described our invention and its operation, what We claim is 1. In a j ack, the eo1nbination,with the frame thereof having a slotted front, of a gear-case mounted in the frame and carrying a train of gears, and a projecting power-shaft adapted to actuate the gears, and a rack-bar mounted for reciprocation within the case and arranged in mesh with one of said gears, and carrying a lifting-arm projecting and depending from the upper end of the rack-bar and adapted to operate in the slot of the frame, substantially as speci'iied.

ln a lifting-jack, a series of gears and a rack-bar adapted to be actuated thereby and provided with a trip, in combination with a bell and a hammer for the same adapted to be actuated by said irip, substantially as specified.

2S. In a jack, a series olf gears mounted in the gear-case, a rack-bar adapted to be aetuated by the gears and provided with a tripping-pin, in combination with a bell, and a spring-actuated. bell-hammer connected with the bell-crank lever, arranged in the path of the trip and adapted to be actuated thereby against the tension of' the spring, substantially as specified.

4. In a jack, the combination, with the front and rear Walls, l and 2, the former slotted, as at 23, and having the guide-plate 2i, of the gear-case 8, having the shafts 9 15 18, carrying the gears 13, 1.4i, 16, 17, and 19, the rack 20, meshing with the gear 19 and having the head 21, and depending lifting-arm 22, terminating in an angular end, 25, and adapted for reeiprocation in the slot 29 substantially as specified.

5. The rack-bar 29, having the pin .35 and the gears Afor operating said rack-bar, in coinbination with the bell 2G, the spring 28, terminatin in the eye 30, bent as at 29 and having the hammer 3l, and the bell-crank lever 33, pivoted, as at 32, and connected to the eye by the link 3l and projected in the path of the pin 85, substantially as specified.

ln testimony whereof We affix our signatures in presence of two Witnesses.

BENGT AUGUST SAllLlllANiNi. JOSOF SG1-DEN OUSK'Y. Witnesses:

XXYILLIAM C. WILSON, S. F. ScHLEIHs. 

